Actuating mechanism for pressing machines



Jan. 9, 16945.

E. DAVIS v ACTUATING MECHANISM FOR PRESSING MACHINES 4 Sheets-Sheet 1 Filed July 30, 1941 INVENTOR. ERNEST DAVIS WW ATTORNEYS.

Jan. 9, 1945. E. DAVIS ACTUATING MECHANISM FOR PRESSING MACHINES Filed July 30, 194]. 4 Sheets-Sheet 2 Ne I .TW s mm we \0 ow 2 2 mm mm ll-Ml. no v 3 t. om mm 'J m 9 um m mm 5 Jan. 9, 1945. E. DAVIS I 2,367,102

' ACTUATING MECHANISM FOR PRESSING MACHINES I Filed July so, 1941 4 Sheets-Sheet 3 FIG. 7

,0 9 INVENTOR.

- ERNEST DAVIS m MW? Z51 FIG. 6

Jan. 9, 1945. E. DAVIS 2,367,102

ACTUATI NG MECHANISM FOR PRESSING MACHINES Filed July so, 1941 '4 Sheets-Shee t 4 INVENT OR. ER NEST DAVIS IO 2 S Patented Jan. 9 1945 2,367,102 OFFICE f ACTUATING MECHANISM FOR PREQSSING MACHINES Ernest Davis, Syracuse, N. Y., assignor to The Prosperity Company, Inc., Syracuse, N. Y., a

corporation of New York Application July :30, 1941, Serial No. 404,693

' (o1. se -41) Claims.

This invention relates to machines having an opening and closing movement, as garment and laundry presses, and machines having a similar anism for closing the press from wide open to nearly closed position with a quick movement, and minimum expenditure of power, and a short powerful final closing or heavy pressing movement with a minimum expenditure of power.

The invention further has for its object actuating mechanism in which thesourceof power is successively operated motors and a coupling which couples the actuating mechanism to the movable element of the press at the end of the preliminary closing movement, this coupling being operated before the motor efiecting the final closing movement is energized.

- It further has for its object motion transmitting,

In describing this invention, referenceishad to k the, accompanying drawings in which like characters designate corresponding parts in all the views.

,Figures 1 and 2 are side elevations,'partly in section, of a pressing machine embodying this operation, and has for its object actuating mechactuating mechanism, the parts being shownfin Figure 5 is a diagrammatic view of the two hand.

control mechanism for of the press.

Figures 6, 7 and 8 are views similar to Figures 1,

controlling the operation 2 and 5 of a slightly different embodiment of the invention.

The pressing machine may be of any suitable form, size and construction, that here shown being of the type in which the relatively movable pressing elements are a stationary buck l and a head 2 movable toward and from the buck; The buck is mounted through a suitable bracket 3 on a.

frame 4. The buck is located above the top or table 5 of the frame.

suitable construction. i i

6 is a lever pivoted at 1 between its ends to an upright 8 in the rear of the frame, the head 2 being carried on one arm of the lever. The lever 6 is here shown as curved or arcuate, and the other arm 9 thereof extends downwardly into the frame The framed may be of any,

pivot 'I of the head-carry ng levert,

through the upright 8 which is channel-shaped in cross-section. The actuating means is connected to or coacts with the arm 9 of the lever. The press here shown is power actuated and the actuating mechanism includessuccessively operated motors for effecting the preliminary closing and the final heavy pressure closing, respectively, and also in one embodiment of the invention, a third motor which shifts motion transmitting parts in motion to transmitting relation at the end of the preliminary closing movement to couple the head-carryingv lever in heavy pressure motion transmitting relation to the second motor which effects final heavy pressure. The power used, in the illustrated embodiment of the invention, is compressed air and hence the motors are pressure-operated motors, as cylinders and pistons.

ll designates the cylinder, and I2 the piston therein for eifecting the preliminary closing, the cylinder being hereshown as mounted to oscillate during the movement of the piston, it being here shown as pivoted at l3 to the frame 4 beneath the table 5 and as extending rearwardly from its pivotal point. The rod M of the piston is pivoted at l5-to the rear arm 9 of the head-carrying lever 6. The second motor for effecting the final heavy pressure includes a cylinder l6 having a piston l1 therein, the cylinder being located in the lower part or base ofjthe frame and pivoted at I8 to the frame to have an oscillating movement. The rod IQ of the piston isoperatively connected to a thrust bar 20, it being here-shownas connected thereto, as by a lever 2| having a long and short arm, the lever being pivoted at 22 to the frame toward the front thereof and the long arm extending downwardly from the pivot and pivoted at 23 to the piston rod 19. The short arm of the lever extends upwardly above the pivot and is pivoted at 2& to the front end of the thrust bar 20 which extends rearwardly in the frame from its pivot 24, it extending in a general tangential direction to the arcuate path of movement of a, shoulder 25 on the lever 9, here shown as at the extreme lower end of the lever. The shoulder 25 slidably engages the bar 25 during the preliminary closing of the press, and as here shown, moves along arcuate track 26 on the upper side of the bar 20, the arc of the track 26 being struck from the axis of the The thrust bar 20 is provided-at its rear end with a seat or. buffer 27 for receiving the shoulder 25 and also with a thrust shoulder 28 adjacent the seat for thrusting against the shoulder 25 at the end of the' preliminary closing movement. The shoulders 25 and 28 have a ratcheting action into engagement with each other, and as here shown the bar 20 is mounted to shift about its pivot 24 to provide the ratcheting action to move'the shoulder 28 in front of the shoulder 25 at the end of the preliminary closing of the press head 2.

This shifting movement of the bar is here shown in Figures 1, 2 and 3 as efiected by a third cylinder and piston motor. 29 designates the cylinder; 30 the piston therein, the cylinder being mounted at 3| to the frame to have an. oscillating movement and the rod 32 of the piston being pivoted to a rocking or crank member 33 which is pivoted between its ends at 34 to the frame, this rocking member being connected to the bar 20 .by a link 35 pivoted at its upper end at 36 to the bar 20 and at its lower end to. the rocking member 33. The rocking member or lever 33 has a crank motion which it transmits through the rod 35- to the thrust bar 20, and owing to this crank motion, the movement of the thrust bar 25 about the pivot 24 to carry the shoulder 28 in front of the shoulder 25 on the head-carryinglever 6 is smooth and without appreciable shock or jar, when the shoulder 25'- clears the shoulder 28.

The press is closed against the action of a suitable means, as a spring. or springs S tending to open it. The operation, as thus far described-to close the press is as follows:

Air is first admitted to actuate the piston I2' and thus preliminarily close the press head 21 down on the work on the buck I. During this movement, the shoulder 25" slides along th track 25 and at the end of the closing movement, clears theshoulder 28 and seats on the buffer 2'1 At the same time or immediately after the admissionof air to the cylinder H, air enters the cylinder- 29 and tends to actuate the piston 30; but the actuation is blocked until the shoulder 25- clears the shoulder 28 when the piston immediately acts to'movethe rear end of the bar 20 upwardlyabout the pivot 24 carrying the shoulder 28 in thrusting relationto the shoulder 25. Air isthen admitted to the cylinder IE to actuate the piston IT therein and rock the lever to cause the short arm thereof to thrust the .bar 20 rearwardly and thus close the press under final pressure upon a short movement of the piston 11-. The

flow of air is controlled through the cylinders successively by a two-hand control, as will bepresently described.

The control here shown for effecting the 01 erationof the cylinder and piston motor l6, IT successive tothe operation of the cylinder and piston motor H, l2 and 29, 30* comprises a pair of manuals, means operated by thesimultaneous operation thereof for opening a master valve which controls the flow of air to the cylinders H, 29 substantially simultaneously, and a relay valve controlled by the operation of the motor- 29 orthe piston therein, when it has traveled a predetermined distance on its power stroke and operable to permit the passage of' air from themain air line to the power cylinder I6 which actuates the thrust bar to close the press underfinal heavy pressure, after being preliminarily closed by the cylinder and piston H, 12;

31 and- 38 designate the manuals, these bein shown as levers located beneath the front portion of the table 5 and having their handles 39; 40 extending through openings above the table; where they are easily accessible. Each manual valve head 53 or 54 carried by an arm or lever 55 pivoted between its ends at 56 to an axially movable rod 51 thrusting against the stem of a valve member 58 located in a valve casing 59. The valve member 58 is a combined intake and exhaust valve, and as here shown includes a normall open exhaust valve head -60 and a normally closed intake valve head 6| connected together, so that they act as a unit, the valve being held in its normal position by a spring '62 acting against the intake valve head 61. When the rod 51 is actuated, it closes exhaust valve head 60 and opens intak valve head 6|, permitting air ,to enter from a main air line 63 into the valve casing 59 past the open exhaust valve head 61' through pipe Mand branch 65 thereof to the intake port 65' in the head ofthe cylinder I! to actuate the piston l2 therein on its power stroke, and at the same time air passes from the pipe 64' through pipe 61, the port 68 of the cylinder 29 to actuate the piston 30 therein on its power stroke against the action of return When the piston 30' has traveled a predetermined distance, sufficient to move the spring 69'.

rear end of the thrust bar upwardly, so that the'shoulder 28 of the thrust bar thrusts against the shoulder 25 of the lever '6, the piston passes a port HJ -in the side of the cylinder 29, so that air passes through pipe H past the check valve -'l2 to the pressure side of the diaphragm chamanormally closed intake valve head 8! held closed by a spring 82. The two valve heads are connected together to act as'a unit and the valve casing at the intake end thereof is connected toa main air line 83.

When air enters the diaphragm chamber 13- and deflects the diaphragm 14" therein, the intake valve head 81 of the relay valv is opened and the exhaust valve head 811- closed, so that air enters the relay valve casing from the main line 83 and passes through pipe 95 to the cyloperatesthe movable member or piston 41 or 4 2* of a pressure-operated motorincluding a cylin- .der 43 or 44 in which thepiston M or 42 works.

The cylinder is connected bya pipe 45 or 46 to the-pressure side of a diaphragmchamber 41,.48, each having a diaphragm, as 49,. therein. and having a stem as 50 provided with a. valve seat 5| or 52- at its outer end coacting: with aihd'er l'6 to actuate the piston IT, and hence thethrust bar 20;

The stems 50 of thediaphragms 49 areformed with axial passages 84 leading through the valve seats 5|, 52" and also opening into the pressure sides of the diaphragm chambers 47, 48.

ofa returning spring 85. When both manuals 39, 40 are operated simultaneously, the lever 55' is pushed rectilinearly outward and the rod 5-!- moved'therewith against the action of the spring 85, thus'closing the exhaust valve 60 and opening the intake valve head BI. If, however, one manual 39 or 40 only is operated, the corresponding diaphragm in the chamber 4! or 48" only is operated, thus causing the lever 55 to tilt about its pivot 55 and this tilting unseats the corresponding valve'head- 54 from the valve seat 52' permitting the air to exhaust from the pressure side of the diaphragm through the passage 84; and without moving the rod 51' axially; thus both manuals must be operated substantially simultaneously. The pressure side of each diaphragm chamber 4 or 48" is provided with a check valve controlled inlet 86 topermit the inlet of outside airinto the diaphragm chamber.

Release'means for opening the press comprises The axial movement of the rod 5'l'is against the-action a release valve for exhausting theair from the pressure side of the diaphragm chamber 13, thus permitting the combined intake and exhaust valve 8|, 90 in the relay valve casing 19, which controls the supply of air to the power cylinder I6, to' close and the exhaust valve head 80 to open andlet air exhaust from the power cylinder I6, and thereby permitting the thrust .bar to return to the right (Figure 1) to its normal position. The air in the cylinder I I releases when the operator lets go of the two hand controls, which he does when the press closes and locks, thus permitting the air to exhaust back through the pipe 64 andout through thevalve casing 59. At the same time,

air also exhausts from th cylinder 29 through the pipes '67, 64 and valve casing 59. However, the piston 39 in the cylinder 29 is not then retracted 'by its spring 69 because the thrust bar is held in the position shown in Figure 2 bythe friction between the shoulders 25, 28, due to the thrusting of the bar 29 under theaotion of the piston I? in the cylinder 1 6. The air .is exhausted from the cylinder It to permit the press to open under the influence of the counter spring or springs S by exhausting the air from the cylinder I6 through the valve casing I9 by closing the intake valve head 9| and opening the exhaust valve head 80. This is effected by the release.mechanism for releasing the .air from the diaphragm chamber73 while operating the release valve lever 92. i

The release valve comprises a casing 99 having a normally-closed, spring-pressed exhaust valve 9I therein, which is opened by a suitable operat-'.

ing lever 92 thrusting against the stem. 93 of the exhaust valve to open it. The release lever 92 is shown as located on the front edge of the table 5. The exhaust valve casing has a port therein connected by a pipe 94 to the pressure side of the diaphragm chamber I3. Thus, upon opening of the release valve 99, the air exhausts frorn'the diaphragm chamber 73 permitting the spring 82 to close the intake and exhaust valve head BI and open the exhaust valve head 80 of the relay valve I9, so that air can exhaust from the cylinder I6 through the pipe 95 out through the valve casing I9, permitting the press to open.

The opening and closing movements of the head 2 ,are controlled by suitable means to pre-.

vent violent action and reaction of the head, or to prevent slamming of the press into finally closed position, but at the same time permit quick preliminary closing, and also prevent violent reaction when the power is released to open the press, but permitting a quick smooth opening of the press head 2 without coming to a violent stop when it approaches wide open position. This means may be a suitable governor or shock absorber 95 having a movable member provided with a crank arm 97 which is connected to the headcarrying lever by a rod 98.

In Figure 4, the function of the cylinder and piston 29, 39 is eifected by the cylinder II which is the motor means for preliminarily closing the press and also moving the thrust bar 2!] intothrusting engagement .with the head-carrying lever 8. In Figure 4, the crank member 330 operates correspondingly to the lever 33 (Figures. 1

and 2), and is actuated by the re-action on pivot I3 of the cylinder I I during the movement of the piston therein, and upon operation of the cylin-.

der II, the thrust barZD is operated to the position shown in Figure 2, wherein the shoulder v of; the levert contacts the shoulder 28 of the thrust bar 20. r i

press re-act to open the press.

In Figures 6, '7 and 8, another embodiment of the invention is shown in which the thrust bar is normally urged as by a spring, into position to from the shoulder 25 by power or air pressure. In

Figures 6 and 7,'-the thrust bar 20 is normally under an upward pressure tending to latch the shoulder 28 with the shoulder 25 but upward movement of the thrust bar is prevented whenthe press is open, by the fact that the shoulder 25 is engaged with the arcuat track '26. When the press closes in the position shown in Figure 7 and the shoulder 25 clears the shoulder 28, the thrust bar is thrust upwardly by a spring I ill thrusting upwardly on a piston I02 in ,a cylinder I03. The rod of the piston is pivoted to the rear end of the thrust bar at I05. To open the press air is admitted to the upper end of the cylinder I03 through a port I96 which moves the piston downwardly against the action of the spring I5] I, movingthe shoulder 28 downwardly out of engagement with the shoulder 25; When'the shoulder 25 is released, the counter-acting springs of the The flow .of air to the port I96 through a pipe I 37; is controlled by the release lever. The cylinder I 03 is provided with a suitable bleeder valve N38 for permitting the air to escape when the piston I02 is being moved upwardly by the spring WI. The bleeder valve, however, is of not sufficient capacity to pass enough air to prevent the piston I62 from being actuated by the air pressure through the pipe I91.

The two hand control for'the form shown in Figures 6 and 7 is substantially the same as that shown in Figure 5, with the exception that the release valve permits air to flow through the pipe I01 to the cylinder I 03 and also with the exception that the operation of the valve for controlling the flow of fluid to the high pressure cylinder I8 is operated by pressure taken from the low pressure cylinder II when the piston I2 has traveled a "predetermined distance, on its power stroke, all as will appear in the following description of the operation of the two hand control shown in Figure 8.

Upon the operation of the manuals 99, 40, the valve mechanism in the casing 59 is operated, as in Figure 5, and the air passes from the main line 63 through the valve casing 59, pipe 64 to the'cylinder II to actuate the piston I2 therein.

'When the piston has traveled a predetermined distance on its power stroke, this being when the head 2 is. preliminarily closed in contact with the work on the buck I it uncovers a port H19 in the side of the cylinder II, permitting air to pass through a pipe III) past the check valve 12 to the diaphragm chamber 13 to cause the diaphragm I4 thereof to operate the valve mechanism in the valve casing 19 through the lever 16, all as in Figure 5. The air then passes in from the main line 63 through the valve 79 to the final pressure cylinder I6, as in Figure 5. When the mechanism within the valve casing 79 is operated to open the intake valve head BI and close the exhaust valve head 69, the air passes through a passage I I I into the diaphragm chamber I3 and holds the diaphragm 14 in its operated position, thus lockingthe press closed. To open the press, the release lever 92 is operated to operate the valve member in a release valve casing H2, this valve member consisting of a normally open exhaust valve'head I I3 and a normally-closed, spring-pressed intake valve head H4, these two valve heads being connected together so that they act as a unit. Upon operation of the release lever 92, the exhaust valve head H3 is closed and the intake valve head II4 open, thus permitting air to pass from the feed line 63-v through pipe II5 through the valve casing H2 through outlet pipe I16 to the pressure side of a diaphragm. chamber II! to actuate the diaphragm IIB therein, this thrusting through a stem H9 against the lever 16. This operation of the lever I6 releases the valve mechanism within the casing I9, so that the intake head BI closes and the exhaust valve head 66' opens, permitting air to exhaust from the high pressure cylinder Hi. The air exhausts from the cylinder II back through the valve mechanism in the casing 59, when the manuals 31, 38 are released. The air also passes from the valve casing II2 through pipe I20 and a check valve I21 therein to the intake port of the cylinder I03, so that when the release lever 92 is operated, the piston I02 in the cylinder I03 is momentarily depressed against the spring IIH, thus releasing the shoulder 28 from the shoulder and permitting the press to open.

What I claim is:

1. In a pressing machine including a frame, coacting pressing elements, one of which is movable toward and from. the other, and has a two step movement, one a preliminary closing and the other a final pressure movement, and a lever pivoted to t -e frame and carrying the movable element; the combination of a thrust bar coacting with the lever, the lever being normally disconnected from the thrust bar, and operator controlled power actuating means upon one operation to automatically and successively actuate the lever to effect the first step, and to shift the thrust bar into thrusting relation to the lever at the end of the first step, and actuate the thrust bar to apply the thrust of the same to the lever to effect the second step.

2. In a pressing machine including a frame, coacting pressing elements, one of which is movable toward and from the other, and has a two step movement, one a preliminary closing and the other a final pressure movement, and a lever pivoted to the frame and carrying the movable element; the combination of a thrust bar coacting with the lever, the lever having a shoulder, the thrust bar extending substantially tangent to the arcuate path of movement of the shoulder, the bar also having a surface extending lengthwise thereof with which the shoulder sli'dably engages during the first step, the bar also having a shoulder located at the end of said surface to engage and thrust against the shoulder on the lever at the end of the first step and operator controlled power actuating means to successively actuate the lever to effect the first step, shift the thrust bar to carry itsshoulder into thrusting engagement with the shoulder of the lever at the end of the first step and actuate the thrust bar relatively to the lever and the shoulder thereon to apply the thrust of the bar to the lever through said shoulders to effect the second step, the slidable engagement of the shoulder of the lever with said surface of the thrust bar operating to block movement of the thrust bar by said power actuating means during'the first step.

3 In a pressing machine including a frame, coacting pressing elements, one of which is movable toward and from the other, and has a two step movement, one a preliminary closing and the other a final pressure movement, and a lever pivoted to the frame and carrying the movable element; the combination of a thrust bar coacting with the lever, the lever having a shoulder, and the bar extending substantially tangent to the arcuate path of movement of the shoulder, the bar having a surface extending lengthwisethereof with which the shoulder on the lever slidably engages during the first step, the thrust bar having a shoulder at the end of said surface and located to coact with the shoulder on the lever at the end of the first step, the thrust bar having a shifting movement transversely of its thrusting movement to bring its shoulder into coaction with the shoulder on the lever, and operator controlled power actuating, means'to successively actuate the lever to effect the first step, shift the thrust bar to carry its shoulder into thrusting engagement with the shoulder on the lever and to actuate the thrust bar to apply the thrust of the same through said shoulders to effect the second step, the portion of the actuating means for effecting the shifting of the thrust bar into thrusting relation to the lever including motion transmitting mechanism embodying a rocking member having a crank action, the slidable engagement of the shoulder of the lever with said surface of the thrust bar operating to block the shifting of the thrust bar by said power actuating means during the first step.

4. In a pressing machine including a frame, coacting pressing elements, one of which is movable toward and from the other, and has a two step movement, one a preliminary closing and the other a final pressure movement, and a lever pivoted to the frame. and carrying the movable element; the combination ofa thrust bar coacting with the lever at the end of the first step, the lever being normally disconnected from the thrust bar and connected thereto in thrusting relation at the end of the first step, motor means connected to said lever and to the bar to successively effect the first step and to move the bar into thrusting relation to the lever, the lever and the bar coacting to block movement of the bar by the motor means during the first step, a final pressure motor and connections between the same and the thrust bar to effect the thrusting movement of said bar, operator-operated control means operable upon single operation to control the successive operations of the motor means and the final pressure motor, and release means for efi'ecting the opening of the press.

5. In a pressing machine including a frame,

coacting pressing elements, one of which is movable toward and from the other, and has a two step movement, one a preliminary closing, and the other a final pressure movement, and a lever pivoted to the frame and carrying the movable element; the combination of a thrust bar coacting with the lever at the end of the first step, the lever being normally disconnected from the thrust bar, and connected thereto in thrusting relation at the end of the first step, motor means connected to said lever and to the bar to effect the first step and to move the bar into thrusting relation to the lever, the lever and the bar coactin to block movement of the bar by the motor means during the first step, said motor means including two motors, one connected to the lever and the other to the bar, a final pressure motor, and connections between the same and the thrust bar to effect the thrusting movement of said bar, operator operated control means operable upon a single operation for effecting the operation of the final pressuremotor successively to the operationof the two former motors, and release means for effecting the opening of the press.

6. In a'.pressing machine including a frame, coacting pressing elements, one of which is movable toward and from the other, and has a two step movement, one a preliminary closing and the other a final pressure movement, and a lever pivoted to the frame and carrying the movable element; the combination of a thrust bar coacting with the lever at the end of the first step,

the lever being normally disconnected from the thrust bar, and connected thereto in thrusting relation at the end of the first step, motor means connected to said lever and to the bar to effect the first step and tend to move the bar into thrusting relation to the lever, the lever and the bar coacting to block movement of the bar by lease means for effecting the opening of the press,

the slidable engagement of the shoulder of the lever with said surface of the thrust bar operating to block radial movement of the thrust bar during the first step.

9. In a pressing machine including a frame, 00-

, acting pressing elements, one of which-As movable oted to the frame and carrying the movable elethe motor means durin the first step, said mo- I tor means including a motor connected to the lever to shift the latter, a final pressure motor,

connections between the same and the thrust bar toefiect the thrusting movement of said bar, operator controlledmeans operable upon a single operation for effecting the operation of the final pressure motor successively to thefirs't motor, and release means for effecting the opening of the press.

7. In a pressing machine including a frame, co-

acting pressing elements, one of which is movable toward and from the other, and has a two step movement, one'a, preliminary closing and the other a finalpressuremovement, and a lever pivoted to the frame and carrying the movable element; the combination of actuating means including a motor connected to the lever to actuate the same to effect the first step, a second motor and a thrust bar operatively connected there to and coacting with the lever at the end of the first step, the lever having a shoulder and the bar extending substantially tangent to the path of movement of the shoulder, the shoulder slidably. engaging the bar during the first step and the bar having a shoulder for coacting with the former shoulder, the first shoulder being movable into position to be engaged by the last shoulder during the first step, means for shifting the bar to engage said shoulders in thrusting relation, a

third motor operable to shift the thrust bar into thrusting relation to the lever, operator-operated control means operable upon a single operation for controlling the operation of the second motor successively to the operation of the first and third motors, and means for releasing the motors to open the press.

8. In a pressing machine including a frame, coacting pressing elements, one of which is movable toward and from the other, andhas a two step movement, one a preliminaryplosing and the other a final pressure movement, and a lever pivoted tothe frame and carrying the movable element; the combination of actuating means including a motor connected to the lever to actuate the same to effect the first step, a second motor, a thrust bar operatively connected thereto and coacting with the lever at the end of the first step, the bar extending in a direction tangential to an arc struck from the axis of the lever and I having a, surface extending lengthwise thereof,

the lever slidably engaging said surface during toward and from the other, and has a two step movement, one a preliminary closing and the other a final pressure movement, and a lever. pivment; the combination of actuating means including a motor connected to the leverto actuate the same to effect the first step, a second motor and a thrust bar operatively connected thereto and coacting with the lever at the end of the first step, the lever being normally disconnected from the thrust :bar, means for connecting the lever and the thrust bar in thrusting relation at the end of the first step, including a third motor operable to shift the bar into thrusting relation to the'lever, the lever and the bar coacting during the first step to block shifting of the bar, motion transmitting means between the third motor and the bar including a member having a crank action, operator controlled means for controlling the operation of the second motor successive to the operation of the first and third motors, and means for releasing the motors to permit the 40 press to open.

10. In a pressing machine ,including a frame,

a-ble toward and from the other, and has a two step movement, one a preliminary closing and the other a final pressure movement, and a lever pivoted to the frame and carrying the movable element; the combination of a thrust bar coacting with the lever at the end of the first step, the lever being normally disconnected from the thrust bar, and connected thereto in. thrusting relation at the end of the first step, motor means connectedto said lever and to-the bar to effect the first step and to move the bar into thrusting relation to the lever, the lever and the bar coacting to block movement of the bar by the,

. motor means during the first step, said motor means including two motors, one having cylinder and piston members, one member being connected to the lever and the other member to the thrust bar, the thrust bar having an angular crank arm to which said other member is pivoted, the other motor being a final pressure motor, connections between the same and the thrust bar including a thrust bar is pivoted at the angle of the thrust bar and its angular crank arm, operator-operated control means for effecting the operation of the final pressure motor successively to the operation of the motor for effecting the first or preliminary closing step, and release means for effecting the openingof the press.

ERNEST DAVIS.

lever to an arm of which the 

